CN1040495C - Automatic detection of kind of cable converter unit coupled to a VCR - Google Patents
Automatic detection of kind of cable converter unit coupled to a VCR Download PDFInfo
- Publication number
- CN1040495C CN1040495C CN92114367A CN92114367A CN1040495C CN 1040495 C CN1040495 C CN 1040495C CN 92114367 A CN92114367 A CN 92114367A CN 92114367 A CN92114367 A CN 92114367A CN 1040495 C CN1040495 C CN 1040495C
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- China
- Prior art keywords
- signal
- control
- cable box
- channel
- remote
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/20—Circuits for coupling gramophone pick-up, recorder output, or microphone to receiver
- H04B1/202—Circuits for coupling gramophone pick-up, recorder output, or microphone to receiver by remote control
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
- H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
- H03J1/0025—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor in a remote control unit
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Details Of Television Systems (AREA)
- Selective Calling Equipment (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
A VCR controls a cable box, and monitors television signals received from the cable box in a ''closed loop'' manner. By monitoring an appropriate signal the controller of the VCR can detect perturbations of signal level which indicate that the cable box has changed channels. That is, the output signal of the cable box remodulated on, for example, the RF carrier frequency of channel 3, will be momentarily lost during the period in which the cable box changes channels. Thus, the subject apparatus can automatically determine the proper control code format for the cable box by issuing a channel change command and observing if the cable box responds to the channel change command. In one embodiment of the invention the VCR causes an on-screen display of an error message if it determines that it is unable to control the cable box.
Description
The present invention relates to video cassette recorder (VCR) and to the equipment of its programming.
Relevant with present patent application and agent docket that transfer same assignee's patent application has RCA86462, RCA86526 and RCA86528.
When the owner of a television set is the user of a cable television system but also when having a video tape recorder (VCR), he then may require to be connected with this cable system through a cable decoder case (also being called CATV transducer or a front end converter).This connection may need because the many cable channel in the middle of these systems (being so-called charging channel) are by scrambling (promptly be encoded or encrypt), and must be in this cable box descrambling (promptly decode and decipher).This cable box is to this charge descrambling and with cable channel frequency inverted to the cable box output frequency of its RF carrier wave rate from its appointment, this output frequency normally by VCR as receiving and the frequency of 2,3,4 or 5 channels record or that play by television receiver.In a such device, its beholder has nearly three remote control unit with control of video equipment (promptly one is used for television set, and one is used for VCR and one and is used for cable box).
Recently, a kind of programming simplified system is called VCR PLUS
TMSystem's (being made by that Gemstar Development Co., Ltd of the Paasche tower in California) comes out.Briefly, this VCRPLUS
TMSystem class is similar to a standard remote control mobile phone, and this mobile phone is to be utilized the coding of cable control cabinet of control VCR and many manufacturers and the preliminary election programming.This mobile phone utilizes an independent coding that comprises 1 to 8 bit digital to be programmed by the user thereafter, this coding corresponding one specific on given time, date, and the programming on a given channel in a given time limit is arranged.Watch the time that at the most popular gold the program that (for example afternoon 7:00) broadcasts may have a coding that only comprises 1 numeral.On the contrary, the program that broadcasts in least popular watching the time (for example the morning 3:00) may have the coding that comprises whole 8 numerals.Together with standard time and channel information, these codings are printed on the guide part of spectators' local newspaper.Imported these be used for specific, be about to be recorded 1 to the 8 single position digital coding of specific television program after, the user is placed on this mobile phone in the hook switch that is contained on the VCR, to guarantee that this mobile phone is in correct direction, so that data are passed on infrared (IR) receiver and cable box of VCR.In the correct time, this VCR PLUS
TMThe program library update system mobile phone sends to cable box being transferred to desired channel with its connection and with it with IR coding, and delivers to VCR, with its connection and to its programming to write down desired program.
Unfortunately, the VCR PLUS of this uniqueness
TMProgram library upgrades operating handset in " open loop " pattern.In other words, this VCR PLUS
TMProgram library more new cell-phone can't know whether its order reality is received by VCR or cable box, because there is not feedback signal to deliver to VCRPLUS again
TMProgram library is more on the new cell-phone.Problem below this situation has been drawn.Have nearly 44 kinds of cable box IR guidance command forms in the reality.This VCR PLUS
TMMobile phone has the optional remote control form of pre-programmed user of some, so that this mobile phone can be controlled a plurality of cable boxes each.Unfortunately, the selection of this correct command format must be finished by the user.If it is improper that this selection is finished, this VCR PLUS then
TMMobile phone can not be controlled this cable box and this desired channel program can not be by record down.
The present invention will overcome and a kind of relevant difficulty of system that comprises the VCR that connects outside source, and wherein VCR can send command signal, with the output of control outside source, but can not determine whether outside source has normally carried out these orders.Especially said system can not determine whether send command signal with the appropriate signals form.
The purpose of this invention is to provide a kind of output that monitors outside source in " closed loop " mode to confirm that outside source normally receives and exectorial VCR.
VCR of the present invention comprises: a radio frequency (RF) signal input part (RFIN) is used to receive one group of RF signal;
Be coupled to the tuner apparatus (102 of said RF signal input part, 104), be used to receive said one group of RF signal, said tuner apparatus responds a control signal and select a specific RF signal from said RF sets of signals, and said tuner apparatus possesses the ability of a tuning predetermined number channel;
Be used to produce the control device (110) of said control signal, so that said tuner apparatus is selected said specific RF signal;
Be coupled to the device (120,122,125) of said control device, be used for importing data in response to user's operation;
Be coupled to the device (100) of said control device, in order to transmit remote signal to control the outside source of said specific RF signal;
Said control device produces said remote signal and said remote signal is delivered to said remote signal transmission device in response to the signal by said user's input;
It is characterized in that:
Be used to detect the device (130 of an effective TV signal, 131,151,155), said checkout gear is coupled to said tuner apparatus so that receive the said signal that selected, and produce the effective signal identification of a TV signal, and said id signal is delivered to said control device in response to the said predetermined characteristic of signal of having selected;
Wherein, said control device is selected first control signal transformat in the various control signal transformat and said one first signal that transmits said remote signal, so that de-tuned one first channel of the said outside source of said specific RF signal, and transmit second signal of said remote signal subsequently with selected described form, so that de-tuned second channel of the said outside source of said specific RF signal, and monitor that subsequently said id signal is to obtain the variation of said id signal;
Said signal changes as a feedback signal, is performed to guarantee its order corresponding to said remote signal; When not having described variations later on, described control device is selected the second control signal transformat in the described channel tuning order of transmission, with the described second described identification signal of controlling and monitor described variation.
Equipment of the present invention is to control a cable box (that is, the signal source of the video input signals of self) in " closed loop " mode, and monitors the TV signal that receives from cable box.By monitoring an appropriate signal, the disturbance that the VCR controller can detection signal level, this level disturbance indicates this cable box and has changed channel.In other words, the modulation again of this cable box output (signal on the 3rd channel RF carrier frequency for example) will change the channel phase by of short duration losing at cable box.Therefore, equipment of the present invention can be determined the correct control code form as this cable box automatically by sending a channel change order and observing the method whether this cable box responds this channel change order.
If when copying the VCR of the embodiment of the invention to judge uncontrollable cable box, this VCR will produce on the screen of an error message and show.
Fig. 1 illustrates with the block diagram form and introduces VCR of the present invention;
Fig. 2 a and 2b are the schematic diagrames of copying VCR of the present invention;
Fig. 3 is the flow chart of a control program part of the controller of presentation graphs 1;
Fig. 4 a to Fig. 4 g is the screen display that controller produced by Fig. 1.
Referring to Fig. 1, radio frequency (RF) signal is added to a RF input of a tuner pack 102.Under the control of tuner control unit 104, tuner pack 102 is selected a specific RF signal, and this control unit 104 is through a lead 103 tuning control signal to be added on the tuner pack 102, and through a control bus 103 ' adding band conversion signal.Tuner control unit 104 is by controller 110 controls.It comprises 114, one random asccess memory 116 of 112, one read-only memorys of a CPU (CPU) (ROM) and an erasable read-only memory of external electric (EEPROM) 117 controller 110 (can be a microprocessor or microcomputer).Controller 110 produces a control signal, with according to making tuner control unit 104 control tuners 102 remove to select a specific RF signal from this switch dish 120 with from the control signal of user's input of one infrared (IR) receiver 122.IR receiver 122 receives the decode for the remote signal of being sent by remote control unit 125.
First and second baseband video signals (TV) are coupled to video processing unit 155 (having a unshowned selection circuit) and also are added to signal conversion unit 137.Video and audio signal also are sent to a magnetic tape recorder unit 165, this unit with these signal records on a record-reproduce head.Magnetic recording unit 165 has a control input end, and operates under the control of a magnetic tape recorder cell controller 160, and sort controller can be a microprocessor.Arrived the again control of the control signal of seeing controller 110 of magnetic tape recorder cell controller 160.Under the control of controller 110, video-stream processor 140 produces character signal on the screen, and these character signals are delivered to one second input of video signal preprocessor 155, so that be included in the treated vision signal.Controller 110 is through a control input end C control signal converting unit 137, so that from audio signal processor 135 and video signal preprocessor 155, or from several outputs of the magnetic recording unit 165 that is in replay mode, select audio frequency and vision signal, and the signal that these have been selected delivered to a modulator 139, so that it is modulated on the frequency carrier of a specific channel, typically, this specific channel is 3 or 4 channels.So far this part circuit among the Fig. 1 that had discussed is the circuit of the VR520 flask formula video tape recorder of known RCA.
Be different from this RCA VCR520 that has as the operator scheme of " timer programming " of its main programming feature, can both comprise according to equipment of the present invention the programmable features of " timer programming " also comprising " VCR a PLUS
TM" programmable features.Be used for the ROM114 that the above-mentioned feature control program of mentioning is present in controller 110.Electrically Erasable Read Only Memory (EEPROM) 117 is coupled to controller 110, and as storage automated programming channel data, user's inputting channel data and a VCR PLUS
TMProgram library upgrades the non-volatile depositing element of channel conversion data.
Total infrared LED drive circuit of 100 of being marked with is coupled to controller 110 usually, is used for infrared signal is offered such as the outer unit that is the cable box used of a cable television service.The infrared LED drive circuit comprises a filtering capacitor C102, a current-limiting resistance R102, the infrared LED of three serial connections (infrared light emitting diode) D101, D102 and D103, the transistor switch Q101 that a Darlington (darlington) formula connects, a base resistor R101 and a speed-up condenser C101.Controller 110 is also controlled a visible light LED D104, and this control is to carry out through a circuit that contains a resistance R 103 and a transistor Q102.The indicating device that visible light LED D104 starts as an indication timer writing function.
Can recognize thus, will include VCR PLUS in order to the control cable case
TMThe unit of program library update system control code (being VCR in this case) is coupled to the television antenna circuit obvious benefit.It is such so that controller can determine whether that this cable box is just effectively in response to the infrared command that is transmitted.As noted before, existing at the 44 kinds of different cable box infrared remote control command forms of having an appointment.Employing is such as a class " open loop " system that uses in the VCR database update mobile phone, and controller can't learn whether this cable box responds the order that this has transmitted.Therefore,, desired channel conversion can't be realized, desired program can not be write down if this cable box is changed the back unfriendly and selected wrong cable box command code form.
In contrast, equipment according to the present invention is the signal that receives from cable box of the mode control cable case (being himself video input signals source) with " closed loop " and monitor.By monitoring intermediate frequency AGC signal on the line 131 of Fig. 1, controller 110 can detect represents cable box reality receiving the also vibration of exectorial signal level, as the indication that can change channel.That is to say, the output of this cable box, again be modulated at such as the signal on the RF carrier frequency of channel 3 will cable box by send channel change command and determine this cable box whether make correct cable box command code form in response to this channel change command during and by transient loss.
Also can recognize, other signal (for example base band video AGC of " effectively synchronous detecting " signal or 151 couplings of Fig. 1 warp) also can be monitored in case provide it about this order that is transferred to cable box has been received and has been performed feedback information.Its advantage is, be used to detect losing during channel conversion if follow the trail of the signal of baseband video signal (as effective synchronous detecting or base band video AGC) feature, then the present invention is suitable for being used for utilizing on base band rather than with them being modulated in the cable box of the cable TV signal that produces decoding on the specific tv channel frequency again.
With reference to figure 2a, 2b Fig. 3 and Fig. 4 a-4g will be further described the present invention.
Fig. 2 a is a schematic diagram, shows a cable box 210 and is placed on the VCR200, (seeing shown in Fig. 2 b), this VCR 200 is coupled to the RF input through cable box 210.The tuner 102 of Fig. 2 b is identical with earlier in respect of figures 1 described tuner unit 102.For cable TV service, the common practice is at least to the channel of its " charging " encode (being scrambling).Formation shown in Fig. 2 b can be used (cable box requires to decode) when being provided some or all channel to be encoded in some mode by cable TV.In such circuit arrangement, VCR will be used to write down all TVs on the cable box output channel ( channel 2,3 or 4 is typically arranged).The cable box 210 of Fig. 2 a and 2b includes the window 212 of reception IR (infrared) remote signal, so that the conducting of tuning cable box or disconnection, and make the tuner of cable box change channel.The VCR 200 of Fig. 2 a and 2b includes the window 204 of reception IR (infrared) remote signal, so that tuning this VCR opens and closes, so that the tuner 102 of VCR changes channels, and the record and replay of control video tape.VCR 200 also comprises a window 214, and through this window, the IR signal that is produced by VCR is sent to the external unit such as cable box 210.Notice from Fig. 2 b, cable box 210 is preferably through the window 214 reception IR signals of a straight path 216 from VCR 200, and 218 receive the IR signals through one " reflection " path, in reflection path 218, the IR signal can be from a wall or 220 reflections of other object, and the back IR order that produces for this VCR to direction of this IR light arrives this cable box provides bigger guarantee.Be important to note that,, then need bigger IR power to guarantee receiving this remote signal at the cable box place because this " reflection " IR light path 218 is always long to path 216 than more direct back.Reason thus, two infrared LEDs are by along longer reflection path and orientation.The LED that these two common forwards are faced also can be by outwardly away from each other and angled placement (promptly along different paths), so that cover bigger area and increase the chance that this signal of reflection is got back to cable box.This reflection " path " is to be provided with for the user selects cable box not to be placed the situation on the top of VCR.
Referring to Fig. 4 a to Fig. 4 g, suppose to be coupled to the television set 400a-400g that has picture tube 410a-410g respectively according to VCR of the present invention.Shown in Fig. 4 a is a display screen, corresponding to " program " demonstration when key is pressed of remote control mobile phone 125.It should be noted that, press key 1 or key 2, user's TV programme of can programming is so that respectively by VCR PLUS
TMProgram library update system or timer programmed recording are recorded.Options button 3 or key 4 are general programs, need not in this description.
Press in the process at response key 5, then VCR " sets up " (SRTUP), and the screen of displayed map 4b, and this screen provides another that menu of 5 selections is arranged.Option 1 makes the user turn to " normally " (i.e. broadcasting or broadcast) and do saltus step between control tuner 102 tuning CARV (being cable) frequency at control tuner 102.2 of options are facilitated and are implemented one " automated programming " function, and its function is to make to transfer that to shelter device 102 controlled to search all effectively channels and to edit out a channel menu that can obtain whole selected channel and skip the void in whole channel.Choice menus project 4 makes the user can add a channel in menu or leave out a channel from this automated programming scanning menu.Menu item 5 is irrelevant and no longer describe with the present invention.The choice menus project 3 feasible screens that show shown in Fig. 4 c.
Shown in Fig. 2 a and 2b,, mean that the user has the cable TV service and do not need cable box if key 1 is pressed.If key 2 is pressed, just mean that the user has cable box.In the sort of situation, the screen display shown in Fig. 4 d (should understand that " 03 " is the output channel of this cable box, and by user's input), and the information of this output channel is stored.110 of controllers produce the screen display shown in Fig. 4 e, and wherein, the user is instructed to connect cable box and presses " broadcast " key of VCR remote control mobile phone 125.
According to this play command that receives, screen display shown in controller 110 generation Fig. 4 f and execution are as the program of Fig. 3 flow chart.
Among Fig. 3, show the part of the control program of VCR 200 controllers 110.The type of remote control form has been determined on Automatic Program ground shown in Fig. 3, for this form, cable box 210 be programmed in case with its response so that any channel that may be required changes, so that the order of the record TV programme of wanting can correctly be sent to cable box.This program is entered by step 300, and cable command code memory is initialized to 44 on first of pre-programmed coded format in this step.In step 305, cable box channel 2 order is sent to this cable box, and the existing coded number on probation of this cable order (being 01-44) is shown, shown in Fig. 4 f.In step 315, the cable box coding that is used for channel 3 is sent to this cable box.If existing selected cable box command code form is correct, then when cable box when channel 2 turns to channel 3, will in the signal that is monitored (for example video AGC signal), have a variation.In step 325, then seek this variation.Do not occur if change, then this cable box command code is incorrect.In this situation, not cause that the cable command code detects to the such situation of counting 45 (steps 330) as yet for the incremental process of step 320.Count 45 whole command code forms of pre-programmed of expression and all tried out and none success, " NO " path is then as a breakout, and its process ends also withdraws from circulation.Therefore, if in this cable order yardage of step 330 less than 45, then in cable command code memory, add 1 and program enter step 320, return step 305 subsequently and send channel change command again to cable box.If this command code surpasses 44, then get a "No" path from step 330 to 335, may with about 5 seconds kinds (Fig. 4 g) of " failure " information of demonstration on the television screen that this VCR links to each other.This program then withdraws from and returns main menu in step 340.
Return step 325, if the change in TV signal is detected, then get the "Yes" path to step 350, in this step, the command code form number that is detected is automatically stored in order to using in the future.This program withdraws from from step 340 subsequently.
Though specification of the present invention is with reference to VCR PLUS
TMSystem specialization, but will be appreciated that the present invention must not use VCR PLUS
TMProgram library update system, it is just extremely useful to the timer record of standard.
Claims (6)
1. video cassette recorder, it comprises:
A radio frequency (RF) signal input part (RFIN) is used to receive one group of RF signal;
Be coupled to the tuner apparatus (102 of said RF signal input part, 104), be used to receive said one group of RF signal, said tuner apparatus responds a control signal and select a specific RF signal from said RF sets of signals, and said tuner apparatus possesses the ability of a tuning predetermined number channel;
Be used to produce the control device (110) of said control signal, so that said tuner apparatus is selected said specific RF signal;
Be coupled to the device (120,122,125) of said control device, be used for importing data in response to user's operation;
Be coupled to the device (100) of said control device, in order to transmit remote signal to control the outside source of said specific RF signal;
Said control device produces said remote signal and said remote signal is delivered to said remote signal transmission device in response to the signal by said user's input;
It is characterized in that:
Be used to detect the device (130,131 of an effective TV signal; 151,155), said checkout gear is coupled to said tuner apparatus so that receive the said signal that selected, and produces the effective signal identification of a TV signal in response to the said predetermined characteristic of signal of having selected, and said id signal is delivered to said control device;
Wherein, said control device is selected first control signal transformat in the various control signal transformat and said one first signal that transmits said remote signal, so that de-tuned first channel of the said outside source of said specific RF signal, and transmit second signal of said remote signal subsequently with selected described form, so that de-tuned second channel of the said outside source of said specific RF signal, and monitor that subsequently said id signal is to obtain the variation of said id signal;
Said signal changes as a feedback signal, is performed to guarantee its order corresponding to said remote signal; When the described channel tuning order of transmission did not have described variation later on, described control device was selected the second control signal transformat, transmitted and monitor the described identification signal of described variation with the described second control signal transformat.
2. video tape recorder as claimed in claim 1 is characterized in that: the said device that is used to transmit is an infrared light emitting diode (LED) assembly, and said remote signal is an infrared signal.
3. video tape recorder as claimed in claim 1 is characterized in that: the said device that is used to detect is automatic gain control (AGC) circuit, and the effective id signal of said TV signal is an AGC signal.
4. video tape recorder as claimed in claim 1, it is characterized in that: the said device that is used to detect is an effective TV synchronousing signal testing circuit, and a signal identification of a said effective id signal of the TV signal detection that is effective TV synchronousing signal.
5. video tape recorder as claimed in claim 1 is characterized in that:
The device (140) that is used for information on display screen on the television display screen curtain;
When said control device can not detect said change in said id signal, said control device made that display unit produces an error message identifier on the said screen.
6. video tape recorder as claimed in claim 1 is characterized in that:
Baseband video signal input (VIDEO IN) is used to receive a baseband video signal;
Said device (100) is used to transmit the remote signal of an outside source controlling said baseband video signal.
Said checkout gear (151,155) be coupled to said baseband video signal input to receive said baseband video signal, and to should be in detection to one of said baseband video signal predetermined feature, produce the effective signal identification of a TV signal, and said id signal is delivered to said control device;
Wherein said control device transmits first signal of said remote signal, so that de-tuned one first channel of outside source of said specific baseband signal, transmit second signal of said remote signal subsequently, so that de-tuned second channel of the said outside source of said baseband signal, and monitor said id signal subsequently, to obtain the change situation of said id signal;
Said change is performed to guarantee its order corresponding to said remote signal as a feedback signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US806,918 | 1985-12-09 | ||
| US80691891A | 1991-12-13 | 1991-12-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1075838A CN1075838A (en) | 1993-09-01 |
| CN1040495C true CN1040495C (en) | 1998-10-28 |
Family
ID=25195138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92114367A Expired - Fee Related CN1040495C (en) | 1991-12-13 | 1992-12-12 | Automatic detection of kind of cable converter unit coupled to a VCR |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5448370A (en) |
| JP (1) | JP2694414B2 (en) |
| KR (1) | KR100292600B1 (en) |
| CN (1) | CN1040495C (en) |
| GB (1) | GB2262374B (en) |
| MY (1) | MY108201A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5420647A (en) * | 1993-01-19 | 1995-05-30 | Smart Vcr Limited Partnership | T.V. viewing and recording system |
| JPH0775030A (en) * | 1993-07-07 | 1995-03-17 | Hitachi Ltd | Television receiver |
| JPH0787411A (en) * | 1993-08-26 | 1995-03-31 | Gold Star Co Ltd | Device and method for automatic changeover of channel of tv and vcr |
| JP3146855B2 (en) * | 1994-05-31 | 2001-03-19 | ソニー株式会社 | Infrared light emitting device and electronic device operation setting system |
| JP3236227B2 (en) * | 1996-09-18 | 2001-12-10 | キヤノン株式会社 | Playback device with built-in editing function |
| KR100756355B1 (en) * | 1999-07-16 | 2007-09-10 | 톰슨 라이센싱 | Method and apparatus for performing a channel search in a television |
| JP4719989B2 (en) * | 2001-02-28 | 2011-07-06 | ソニー株式会社 | Portable information terminal device, information processing method, recording / playback device, program storage medium, and program |
| EP1511306A1 (en) * | 2003-09-01 | 2005-03-02 | Thomson Licensing S.A. | Method for detecting source status changes during time-shift recording |
| US8874056B2 (en) * | 2008-08-26 | 2014-10-28 | Cisco Technology, Inc. | Identifying channels in a communication network |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US496994A (en) * | 1893-05-09 | Thomas j |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5679583A (en) * | 1979-12-03 | 1981-06-30 | Hitachi Ltd | Synchronizing signal discriminator |
| US4425578A (en) * | 1981-01-12 | 1984-01-10 | A. C. Nielsen Company | Monitoring system and method utilizing signal injection for determining channel reception of video receivers |
| US4703359A (en) * | 1985-05-30 | 1987-10-27 | Nap Consumer Electronics Corp. | Universal remote control unit with model identification capability |
| KR950009205B1 (en) * | 1988-07-04 | 1995-08-16 | 삼성전자주식회사 | Channel indicating apparatus in satellite broadcasting system |
| US4977455B1 (en) * | 1988-07-15 | 1993-04-13 | System and process for vcr scheduling | |
| JP2795906B2 (en) * | 1989-06-20 | 1998-09-10 | 株式会社東芝 | Tuning device |
| US5123046A (en) * | 1990-11-05 | 1992-06-16 | Smart Vcr Limited Partnership | Vcr with cable tuner control |
-
1992
- 1992-11-12 MY MYPI9202061 patent/MY108201A/en unknown
- 1992-12-10 GB GB9225780A patent/GB2262374B/en not_active Expired - Lifetime
- 1992-12-11 KR KR1019920023923A patent/KR100292600B1/en not_active IP Right Cessation
- 1992-12-12 CN CN92114367A patent/CN1040495C/en not_active Expired - Fee Related
- 1992-12-14 JP JP4354239A patent/JP2694414B2/en not_active Expired - Fee Related
-
1994
- 1994-02-17 US US08/197,581 patent/US5448370A/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US496994A (en) * | 1893-05-09 | Thomas j |
Also Published As
| Publication number | Publication date |
|---|---|
| KR930015819A (en) | 1993-07-24 |
| GB9225780D0 (en) | 1993-02-03 |
| CN1075838A (en) | 1993-09-01 |
| US5448370A (en) | 1995-09-05 |
| GB2262374A (en) | 1993-06-16 |
| JPH0612849A (en) | 1994-01-21 |
| GB2262374B (en) | 1995-04-05 |
| MY108201A (en) | 1996-08-30 |
| KR100292600B1 (en) | 2001-06-15 |
| JP2694414B2 (en) | 1997-12-24 |
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